<template>
  <!-- 登录组件的根节点 -->
  <div class="login-container">
    <!-- 登录盒子区域 -->
    <div class="login-box">
      <!-- 头像区域 -->
      <div class="avatar-box">
        <img src="../assets/logo.png" alt="">
      </div>

      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login-form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password">
            <i slot="prefix" class="iconfont icon-3702mima"></i>
          </el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456",
      },
      // 登录表单的校验规则对象
      loginFormRules: {
        // 校验规则的名称必须和数据源的属性名称保持一致
        username: [
          { required: true, message: "请输入登录名称", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        password: [
          { required: true, message: "请输入登录密码", trigger: "blur" },
          {
            min: 6,
            max: 15,
            message: "长度在 6 到 15 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    // 点击重置按钮，重置表单的数据
    resetLoginForm() {
      // 重置表单
      this.$refs.loginFormRef.resetFields();
    },
    // 点击按钮登录
    login() {
      // 调用校验表单的方法
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return;
        // 发起网络数据请求
        const { data: res } = await this.$http.post("login", this.loginForm);
        if (res.meta.status !== 200) return this.$message.error("登录失败！");
        this.$message.success("登录成功！");

        // 1. 存 token
        window.sessionStorage.setItem("token", res.data.token);
        // 2. 跳转到后台主页
        this.$router.push("/home");
      });
    },
  },
};
</script>

<style lang="less" scoped>
.login-container {
  background-color: #2b4b6b;
  height: 100%;

  // 美化登录盒子的样式
  .login-box {
    width: 450px;
    height: 304px;
    background-color: white;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px #dddddd;

    // 美化头像盒子的样式
    .avatar-box {
      width: 130px;
      height: 130px;
      padding: 10px;
      border: 1px solid #efefef;
      border-radius: 50%;
      box-shadow: 0 0 10px #ddd;
      background-color: #fff;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #efefef;
      }
    }
  }
}

.login-form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
